Core tasks towards the primary goal:
- Choice of arm cavity geometry: several options are already listed here. We should check the FSR for 15km vs 10km, the impact on overall detector sensitivity bucket and e.g. HOM resonances
- Determine major lengths for 15km: HF SEC length, LF filter cavity length(s), IMC lengths, check if other major lengths (LF SEC, HF FC, PRC lengths), that were non-limiting for 10km become limiting for 15km.
- Develop first recycling telescope designs using the same logic as Δ, using placeholder values before (4)
- Clash detection and 3D considerations: iterations with ETO to a plausible conceptual layout of major elements
- Identify key outstanding tasks before the full 2L layout is as ‘complete’ as the Δ & can be frozen
- Documentation
Additional goals (if key people available):
For the triangle layout:
- Address & resolve any issues raised by ongoing detector layout work
- Improved/completed documentation (gaps in the pdf, parameter file)
For both layouts:
- Tolerance studies (length, angle, RoC)
- Detailed work on priority tasks outlined in the “future work” section of the Δ layout pdf: telescopes needed for auxiliary benches, LF IMC requirements, BHD decision evaluation, Scattered light implications, WF sensing/control strategy for LF (cold defect matching etc)
